Vulnerability · Published Jan 19, 2026 · Assigned by GitHub_M

CVE-2026-23852SiYuan vulnerable to Stored XSS / RCE via `setBlockAttrs` icon attribute

Medium 5.8

In plain English

A medium-severity code injection in siyuan from siyuan-note. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities).

Severity (CVSS 4.0)5.8Medium

Exploit odds (30 days)0.8%top 42.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

SiYuan is a personal knowledge management system. Versions prior to 3.5.4 have a stored Cross-Site Scripting (XSS) vulnerability that allows an attacker to inject arbitrary HTML attributes into the `icon` attribute of a block via the `/api/attr/setBlockAttrs` API. The payload is later rendered in the dynamic icon feature in an unsanitized context, leading to stored XSS and, in the desktop environment, potential remote code execution (RCE). This issue bypasses the previous fix for issue `#15970` (XSS → RCE via dynamic icons). Version 3.5.4 contains an updated fix.

Affected products (as reported)

Vendor	Product	Versions
siyuan-note	siyuan	< 3.5.4

Weakness: CWE-94 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:P

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7c6g-g2hx-23vv x_refsource_CONFIRM
https://github.com/siyuan-note/siyuan/commit/0be7e1d4e0da9aac0da850b7aeb9b50ede7e5bdb x_refsource_MISC